Overview
The ADA4945-1ACPZ-R7, produced by Analog Devices Inc., is a high-speed, low-noise, and low-distortion fully differential amplifier. This device is specifically designed to drive high-resolution analog-to-digital converters (ADCs) and is ideal for various data acquisition and signal processing applications. It operates over a broad power supply range of 3 V to 10 V and features two selectable power modes to optimize performance and power consumption.
Key Specifications
| Parameter | Symbol | Test Conditions | Full Power Mode | Low Power Mode |
|---|---|---|---|---|
| Supply Voltage Range | VS | 3 V to 10 V | 3 V to 10 V | |
| Quiescent Current | Iq | 4 mA | 1.4 mA | |
| Input Voltage Noise | e_n | 2.0 nV/√Hz | ||
| Offset Drift | ΔVOS/ΔT | ±0.1 µV/°C | ±0.1 µV/°C | |
| Common Mode Rejection Ratio (CMRR) | CMRR | ΔVOCM = ±1 V | -130 dB | -130 dB |
| Output Common Mode Voltage Range | VOCM | -VS + 1.3 V to +VS - 1.3 V | -VS + 1.3 V to +VS - 1.3 V | |
| Operating Temperature Range | TA | -40°C to +125°C | -40°C to +125°C | |
| Package Type | RoHS-compliant, 3 mm × 3 mm, 16-lead LFCSP | RoHS-compliant, 3 mm × 3 mm, 16-lead LFCSP |
Key Features
- Broad power supply range: 3 V to 10 V
- Wide input common-mode voltage range: -VS to +VS - 1.3 V
- Rail-to-rail output
- Two selectable power modes: full power mode (4 mA, 145 MHz) and low power mode (1.4 mA, 80 MHz)
- Low harmonic distortion: -133 dBc HD2 and -140 dBc HD3 at 1 kHz
- Fast settling time: 100 ns for 18-bit and 50 ns for 16-bit resolution
- Adjustable common-mode voltage to match multiple ADCs
- Internal common-mode feedback loop for exceptional output balance and suppression of even order harmonic distortion
- Differential gain configurations achieved with a simple external feedback network of four resistors
- Fabricated using Analog Devices’ proprietary silicon germanium (SiGe) complementary bipolar process
Applications
The ADA4945-1ACPZ-R7 is well-suited for a variety of applications, including:
- Driving high-resolution successive approximation register (SAR) and Σ-Δ analog-to-digital converters (ADCs)
- Data acquisition systems
- Signal processing applications
- Evaluation boards for ADCs, where it can be used as a standalone or as an amplifier mezzanine card
Q & A
- What is the power supply range of the ADA4945-1?
The ADA4945-1 operates over a broad power supply range of 3 V to 10 V.
- What are the two selectable power modes of the ADA4945-1?
The device has two selectable power modes: full power mode (4 mA, 145 MHz) and low power mode (1.4 mA, 80 MHz).
- What is the input voltage noise of the ADA4945-1 in full power mode?
The input voltage noise is 2.0 nV/√Hz in full power mode.
- What is the offset drift of the ADA4945-1?
The offset drift is ±0.1 µV/°C.
- How is the common-mode voltage adjusted in the ADA4945-1?
The common-mode voltage is adjustable to match the input common-mode voltage of multiple ADCs.
- What is the operating temperature range of the ADA4945-1?
The device operates from -40°C to +125°C.
- What package type is the ADA4945-1 available in?
The ADA4945-1 is available in a RoHS-compliant, 3 mm × 3 mm, 16-lead LFCSP package.
- How is the differential gain configured in the ADA4945-1?
Differential gain configurations are achieved with a simple external feedback network of four resistors.
- What process is used to fabricate the ADA4945-1?
The device is fabricated using Analog Devices’ proprietary silicon germanium (SiGe) complementary bipolar process.
- What are some typical applications of the ADA4945-1?
Typical applications include driving high-resolution ADCs, data acquisition systems, and signal processing applications.
